* Use PcmExport for 24bit packed output

Replaces the static Duplicate() method.

To make things simpler, AllocatedString is now a non-template class.

Per the manual for strptime, %F is equivalent %Y-%m-%d, so use that
directly.

ParseTimePoint.

%Z is a glibc extension to strptime, and is a no-op there, due to the
mapping between timezone names and their definition (especially when the
name comes from a different machine) being ambiguous / impossible.  Time
in HTTP headers is guaranteed to be UTC.

Passing an unknown format to strptime() implementations that don't
support it will generally cause them to return NULL, which will lead to
ParseTimePoint throwing an exception and ParseTimeStamp using an
unnecessary fallback.

Since the timezone name goes at the end of the string, we don't need to
use %Z to skip it (could be an issue in a different time stamp format),
so simply removing %Z works best.

Very rough draft.  Barely works.

By casting to SafeLinkIntrusiveListHook if appropriate, this fixes a
bug in the erase() method, where erase() calls
IntrusiveListHook::unlink() instead of
SafeLinkIntrusiveListHook::unlink().

This reduces delays of zero-duration timers from up to 1 second to
zero.  libavahi-client schedules zero-duration timers often.

The "std::nested_exception" catch block already covers this perfectly.

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1112